Naegele’s Rule

The due date or expected date of confinement (EDC) can be calculated using Naegele’s Rule. Begin on the first day of the last menstrual period (LMP), subtract 3 months, add 7 days, and then add 1 year.

Example
LMP: February 14, 2015
Subtract 3 months (Great Scott x 3): November 14, 2014
Add 7 days (N-A-E-G-E-L-E): November 21, 2014
Add 1 bear (year): November 21, 2015